YS Engine YSF9156 Replacement Low-Speed Needle for .91 .120SC .140 Glow Engines  [YSF9156]

YS ENGINE LOW SPEED NEEDLE VALVE 91 120SC 140 #F9156
Price:
NZD$9.78
Brand:
YS Engine
Model:
YSF9156
Condition:
Brand New
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Dedicated low-speed needle for fine idle control

This RC low-speed needle is designed as a direct replacement where the YSF9156 needle form is used. It addresses fuel metering at idle and under light throttle on .91, .120SC and .140 glow engines.

Use this component when you require accurate low-speed mixture control during tuning or when replacing a worn or damaged needle. Its adjustments influence idle quality and transitional running; careful tuning reduces stalling at low throttle and improves responsiveness in the low RPM range.

Install the needle into the carburetor low-speed seat following the carburetor or engine maker's guidance, and tune stepwise while checking engine response after each change. This product is for RC model glow engine use only and should not be used in full-size engines.

How do I install the YSF9156 low-speed needle correctly?

Locate the carburetor low-speed needle seat, fit the needle in the correct orientation, and follow the engine or carburetor manual for seating and initial settings before performing incremental tuning.

Will fitting this needle change the engine's midrange?

The needle is specific to the low-speed circuit, so changes will mainly affect idle and throttle transition; midrange power is influenced primarily by other carburetor circuits and main jet settings.

Can it be used across different carburetor brands?

Compatibility depends on whether the carburetor accepts the YSF9156 needle form factor; if the form matches, the needle will fit regardless of carburetor brand.

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